package com.vvlive.caibao.smartcity.utils;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.TranslateAnimation;
import android.widget.ScrollView;

/**
 * @author THINK
 * @version 1.0
 * @date 2015-3-19 下午9:01:25
 * @Desc ScrollView阻尼效果
 */
public class ScrollViewUtil extends ScrollView {
    private View inner;
    private float y;
    private Rect normal = new Rect();
    private boolean animationFinish = true;

    public ScrollViewUtil(Context context) {
        super(context);
    }

    public ScrollViewUtil(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @SuppressLint("MissingSuperCall")
    @Override
    protected void onFinishInflate() {
        if (getChildCount() > 0) {
            inner = getChildAt(0);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (inner == null) {
            return super.onTouchEvent(ev);
        } else {
            commOnTouchEvent(ev);
        }
        return super.onTouchEvent(ev);
    }

    public void commOnTouchEvent(MotionEvent ev) {
        if (animationFinish) {
            int action = ev.getAction();
            switch (action) {
                case MotionEvent.ACTION_DOWN:
//              System.out.println("ACTION_DOWN");  
                    y = ev.getY();
                    super.onTouchEvent(ev);
                    break;
                case MotionEvent.ACTION_UP:
//              System.out.println("ACTION_UP");  
                    y = 0;
                    if (isNeedAnimation()) {
                        animation();
                    }
                    super.onTouchEvent(ev);
                    break;
                case MotionEvent.ACTION_MOVE:
//              System.out.println("ACTION_MOVE");  
                    final float preY = y == 0 ? ev.getY() : y;
                    float nowY = ev.getY();
                    int deltaY = (int) (preY - nowY);
                    // 滚动
//              scrollBy(0, deltaY);  

                    y = nowY;
                    // 当滚动到最上或者最下时就不会再滚动，这时移动布局
                    if (isNeedMove()) {
                        if (normal.isEmpty()) {
                            // 保存正常的布局位置
                            normal.set(inner.getLeft(), inner.getTop(), inner.getRight(), inner.getBottom());
                        }
                        // 移动布局
                        inner.layout(inner.getLeft(), inner.getTop() - deltaY / 2, inner.getRight(), inner.getBottom() - deltaY / 2);
                    } else {
                        super.onTouchEvent(ev);
                    }
                    break;
                default:
                    break;
            }
        }
    }

    // 开启动画移动  

    public void animation() {
        // 开启移动动画  
        TranslateAnimation ta = new TranslateAnimation(0, 0, 0, normal.top - inner.getTop());
        ta.setDuration(200);
        ta.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
                animationFinish = false;

            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                inner.clearAnimation();
                // 设置回到正常的布局位置  
                inner.layout(normal.left, normal.top, normal.right, normal.bottom);
                normal.setEmpty();
                animationFinish = true;
            }
        });
        inner.startAnimation(ta);
    }

    // 是否需要开启动画  
    public boolean isNeedAnimation() {
        return !normal.isEmpty();
    }

    // 是否需要移动布局  
    public boolean isNeedMove() {
        int offset = inner.getMeasuredHeight() - getHeight();
        int scrollY = getScrollY();
        if (scrollY == 0 || scrollY == offset) {
            return true;
        }
        return false;
    }
}
//scrollView = (ScrollView) findViewById(R.id.index_scrollview);
/**
 * 监听ScrollView滑动到顶端和底部
 * 1 mScrollView.getChildAt(0).getMeasuredHeight()表示:
 * ScrollView所占的高度.即ScrollView内容的高度.常常有一
 * 部分内容要滑动后才可见,这部分的高度也包含在了
 * mScrollView.getChildAt(0).getMeasuredHeight()中
 * <p>
 * 2 view.getScrollY表示:
 * ScrollView顶端已经滑出去的高度
 * <p>
 * 3 view.getHeight()表示:
 * ScrollView的可见高度
 */
/*scrollView.setOnTouchListener(new OnTouchListener() {

	@Override
	public boolean onTouch(View view, MotionEvent arg1) {
		switch (arg1.getAction()) {
		
		case MotionEvent.ACTION_MOVE:
			int scrollY=view.getScrollY();
             int height=view.getHeight();
             int scrollViewMeasuredHeight=scrollView.getChildAt(0).getMeasuredHeight();
             if(scrollY==0){
            	 tv_show.setVisibility(View.VISIBLE);
                   System.out.println("滑动到了顶端 view.getScrollY()="+scrollY);
                }
             if((scrollY+height)==scrollViewMeasuredHeight){
            	 tv_show.setVisibility(View.GONE);
                    System.out.println("滑动到了底部 scrollY="+scrollY);
                    System.out.println("滑动到了底部 height="+height);
                    System.out.println("滑动到了底部 scrollViewMeasuredHeight="+scrollViewMeasuredHeight);
                }
			break;
		default:
			break;
		}
		return false;
	}
});*/